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<a href="buffer__logger_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno">    1</span><span class="comment">/* Flow</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno">    2</span><span class="comment"> * Copyright 2023 Akamai Technologies, Inc.</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno">    3</span><span class="comment"> *</span></div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno">    4</span><span class="comment"> * Licensed under the Apache License, Version 2.0 (the</span></div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno">    5</span><span class="comment"> * &quot;License&quot;); you may not use this file except in</span></div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno">    6</span><span class="comment"> * compliance with the License.  You may obtain a copy</span></div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno">    7</span><span class="comment"> * of the License at</span></div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno">    8</span><span class="comment"> *</span></div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno">    9</span><span class="comment"> *   https://www.apache.org/licenses/LICENSE-2.0</span></div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno">   10</span><span class="comment"> *</span></div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno">   11</span><span class="comment"> * Unless required by applicable law or agreed to in</span></div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno">   12</span><span class="comment"> * writing, software distributed under the License is</span></div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno">   13</span><span class="comment"> * distributed on an &quot;AS IS&quot; BASIS, WITHOUT WARRANTIES OR</span></div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno">   14</span><span class="comment"> * CONDITIONS OF ANY KIND, either express or implied.</span></div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno">   15</span><span class="comment"> * See the License for the specific language governing</span></div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno">   16</span><span class="comment"> * permissions and limitations under the License. */</span></div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno">   17</span><span class="comment"></span> </div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno">   18</span><span class="comment">/// @file</span></div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno">   19</span><span class="comment"></span><span class="preprocessor">#include &quot;<a class="code" href="buffer__logger_8hpp.html">flow/log/buffer_logger.hpp</a>&quot;</span></div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno">   20</span><span class="preprocessor">#include &quot;<a class="code" href="config_8hpp.html">flow/log/config.hpp</a>&quot;</span></div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno">   21</span> </div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno">   22</span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespaceflow_1_1log.html">flow::log</a></div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno">   23</span>{</div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno">   24</span> </div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno">   25</span><span class="comment">// Implementations.</span></div>
<div class="line"><a id="l00026" name="l00026"></a><span class="lineno">   26</span> </div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno"><a class="line" href="classflow_1_1log_1_1Buffer__logger.html#a489396316d73b8b049a0119bdc57e302">   27</a></span><a class="code hl_function" href="classflow_1_1log_1_1Buffer__logger.html#a489396316d73b8b049a0119bdc57e302">Buffer_logger::Buffer_logger</a>(<a class="code hl_class" href="classflow_1_1log_1_1Config.html">Config</a>* config) :</div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno">   28</span>  m_config(config),</div>
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno">   29</span>  m_os_writer(*m_config, m_os.os())</div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno">   30</span>{</div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno">   31</span>  <span class="comment">// Nothing else.</span></div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno">   32</span>}</div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno">   33</span> </div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno"><a class="line" href="classflow_1_1log_1_1Buffer__logger.html#aa27a237d1cc9d3d9f28c472f521f0163">   34</a></span><span class="keywordtype">bool</span> <a class="code hl_function" href="classflow_1_1log_1_1Buffer__logger.html#aa27a237d1cc9d3d9f28c472f521f0163">Buffer_logger::should_log</a>(<a class="code hl_enumeration" href="namespaceflow_1_1log.html#a5c602384e6fe9d7642740ac2fae4ad04">Sev</a> sev, <span class="keyword">const</span> <a class="code hl_class" href="classflow_1_1log_1_1Component.html">Component</a>&amp; component) <span class="keyword">const</span> <span class="comment">// Virtual.</span></div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno">   35</span>{</div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno">   36</span>  <span class="keywordflow">return</span> m_config-&gt;output_whether_should_log(sev, component);</div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno">   37</span>}</div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno">   38</span> </div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno"><a class="line" href="classflow_1_1log_1_1Buffer__logger.html#ac5d382dae85e7c9f0f51e5e6eebd99a5">   39</a></span><span class="keywordtype">bool</span> <a class="code hl_function" href="classflow_1_1log_1_1Buffer__logger.html#ac5d382dae85e7c9f0f51e5e6eebd99a5">Buffer_logger::logs_asynchronously</a>() const <span class="comment">// Virtual.</span></div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno">   40</span>{</div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno">   41</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno">   42</span>}</div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno">   43</span> </div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"><a class="line" href="classflow_1_1log_1_1Buffer__logger.html#a2e95b58eabbd6632f2856097a74921ec">   44</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="classflow_1_1log_1_1Buffer__logger.html#a2e95b58eabbd6632f2856097a74921ec">Buffer_logger::do_log</a>(<a class="code hl_struct" href="structflow_1_1log_1_1Msg__metadata.html">Msg_metadata</a>* metadata, <a class="code hl_typedef" href="namespaceflow_1_1util.html#ae4dc52186797094b3040379ff19124c9">util::String_view</a> msg) <span class="comment">// Virtual.</span></div>
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno">   45</span>{</div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno">   46</span>  <span class="comment">// Prevent simultaneous logging, reading-by-copy.</span></div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno">   47</span>  <a class="code hl_typedef" href="namespaceflow_1_1util.html#a5d2247b715da63e4b960909561b90ae7">util::Lock_guard</a>&lt;<span class="keyword">decltype</span>(<a class="code hl_variable" href="classflow_1_1log_1_1Buffer__logger.html#aa104818579752436ea7dde1cdf8b3920">m_log_mutex</a>)&gt; lock(<a class="code hl_variable" href="classflow_1_1log_1_1Buffer__logger.html#aa104818579752436ea7dde1cdf8b3920">m_log_mutex</a>);</div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno">   48</span> </div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno">   49</span>  <span class="comment">// m_os_writer wraps (as of this writing) String_ostream, which wraps std::string.  Write msg+metadata to std::string.</span></div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno">   50</span>  <a class="code hl_variable" href="classflow_1_1log_1_1Buffer__logger.html#a5f61d68308b597e131094e4bbcf08b21">m_os_writer</a>.<a class="code hl_function" href="classflow_1_1log_1_1Ostream__log__msg__writer.html#aba0a94e36e435aeb67bbc25fee8380f7">log</a>(*metadata, msg);</div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno">   51</span>}</div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno">   52</span> </div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"><a class="line" href="classflow_1_1log_1_1Buffer__logger.html#a275d3e573627ffe0595043c4fdfe8e19">   53</a></span><span class="keyword">const</span> std::string&amp; <a class="code hl_function" href="classflow_1_1log_1_1Buffer__logger.html#a275d3e573627ffe0595043c4fdfe8e19">Buffer_logger::buffer_str</a>()<span class="keyword"> const</span></div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno">   54</span><span class="keyword"></span>{</div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno">   55</span>  <span class="keywordflow">return</span> <a class="code hl_variable" href="classflow_1_1log_1_1Buffer__logger.html#a143ed6107ce07817f0c7b59354387db3">m_os</a>.<a class="code hl_function" href="classflow_1_1util_1_1String__ostream.html#aa7682e71a5e96955a52643e63bf97ad0">str</a>(); <span class="comment">// (Mutex lock wouldn&#39;t help here, even if we used it, as this returns [basically] a pointer.)</span></div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno">   56</span>}</div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno">   57</span> </div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno"><a class="line" href="classflow_1_1log_1_1Buffer__logger.html#af13a09b5360373f8aeb17f1e459fc677">   58</a></span><span class="keyword">const</span> std::string <a class="code hl_function" href="classflow_1_1log_1_1Buffer__logger.html#af13a09b5360373f8aeb17f1e459fc677">Buffer_logger::buffer_str_copy</a>()<span class="keyword"> const</span></div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno">   59</span><span class="keyword"></span>{</div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno">   60</span>  <span class="comment">// Prevent simultaneous logging, reading.</span></div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno">   61</span>  <a class="code hl_typedef" href="namespaceflow_1_1util.html#a5d2247b715da63e4b960909561b90ae7">util::Lock_guard</a>&lt;<span class="keyword">decltype</span>(<a class="code hl_variable" href="classflow_1_1log_1_1Buffer__logger.html#aa104818579752436ea7dde1cdf8b3920">m_log_mutex</a>)&gt; lock(<a class="code hl_variable" href="classflow_1_1log_1_1Buffer__logger.html#aa104818579752436ea7dde1cdf8b3920">m_log_mutex</a>);</div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno">   62</span> </div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno">   63</span>  <span class="keywordflow">return</span> <a class="code hl_function" href="classflow_1_1log_1_1Buffer__logger.html#a275d3e573627ffe0595043c4fdfe8e19">buffer_str</a>(); <span class="comment">// Copy occurs here; then mutex is unlocked.</span></div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno">   64</span>}</div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno">   65</span> </div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno">   66</span>} <span class="comment">// namespace flow::log</span></div>
<div class="ttc" id="abuffer__logger_8hpp_html"><div class="ttname"><a href="buffer__logger_8hpp.html">buffer_logger.hpp</a></div></div>
<div class="ttc" id="aclassflow_1_1log_1_1Buffer__logger_html_a143ed6107ce07817f0c7b59354387db3"><div class="ttname"><a href="classflow_1_1log_1_1Buffer__logger.html#a143ed6107ce07817f0c7b59354387db3">flow::log::Buffer_logger::m_os</a></div><div class="ttdeci">util::String_ostream m_os</div><div class="ttdoc">Like ostringstream but allows for fast access directly into its internal string buffer.</div><div class="ttdef"><b>Definition:</b> <a href="buffer__logger_8hpp_source.html#l00126">buffer_logger.hpp:126</a></div></div>
<div class="ttc" id="aclassflow_1_1log_1_1Buffer__logger_html_a275d3e573627ffe0595043c4fdfe8e19"><div class="ttname"><a href="classflow_1_1log_1_1Buffer__logger.html#a275d3e573627ffe0595043c4fdfe8e19">flow::log::Buffer_logger::buffer_str</a></div><div class="ttdeci">const std::string &amp; buffer_str() const</div><div class="ttdoc">Read-only access to the buffer string containing the messages logged thus far.</div><div class="ttdef"><b>Definition:</b> <a href="buffer__logger_8cpp_source.html#l00053">buffer_logger.cpp:53</a></div></div>
<div class="ttc" id="aclassflow_1_1log_1_1Buffer__logger_html_a2e95b58eabbd6632f2856097a74921ec"><div class="ttname"><a href="classflow_1_1log_1_1Buffer__logger.html#a2e95b58eabbd6632f2856097a74921ec">flow::log::Buffer_logger::do_log</a></div><div class="ttdeci">void do_log(Msg_metadata *metadata, util::String_view msg) override</div><div class="ttdoc">Implements interface method by synchronously logging the message and some subset of the metadata in a...</div><div class="ttdef"><b>Definition:</b> <a href="buffer__logger_8cpp_source.html#l00044">buffer_logger.cpp:44</a></div></div>
<div class="ttc" id="aclassflow_1_1log_1_1Buffer__logger_html_a489396316d73b8b049a0119bdc57e302"><div class="ttname"><a href="classflow_1_1log_1_1Buffer__logger.html#a489396316d73b8b049a0119bdc57e302">flow::log::Buffer_logger::Buffer_logger</a></div><div class="ttdeci">Buffer_logger(Config *config)</div><div class="ttdoc">Constructs logger to subsequently log to a newly constructed internal std::string buffer.</div><div class="ttdef"><b>Definition:</b> <a href="buffer__logger_8cpp_source.html#l00027">buffer_logger.cpp:27</a></div></div>
<div class="ttc" id="aclassflow_1_1log_1_1Buffer__logger_html_a5f61d68308b597e131094e4bbcf08b21"><div class="ttname"><a href="classflow_1_1log_1_1Buffer__logger.html#a5f61d68308b597e131094e4bbcf08b21">flow::log::Buffer_logger::m_os_writer</a></div><div class="ttdeci">Ostream_log_msg_writer m_os_writer</div><div class="ttdoc">Wrapper around m_os that will take care of prefacing each message with time stamp,...</div><div class="ttdef"><b>Definition:</b> <a href="buffer__logger_8hpp_source.html#l00129">buffer_logger.hpp:129</a></div></div>
<div class="ttc" id="aclassflow_1_1log_1_1Buffer__logger_html_aa104818579752436ea7dde1cdf8b3920"><div class="ttname"><a href="classflow_1_1log_1_1Buffer__logger.html#aa104818579752436ea7dde1cdf8b3920">flow::log::Buffer_logger::m_log_mutex</a></div><div class="ttdeci">util::Mutex_non_recursive m_log_mutex</div><div class="ttdoc">Mutex protecting against log messages being logged, accessing m_os concurrently and thus corrupting (...</div><div class="ttdef"><b>Definition:</b> <a href="buffer__logger_8hpp_source.html#l00135">buffer_logger.hpp:135</a></div></div>
<div class="ttc" id="aclassflow_1_1log_1_1Buffer__logger_html_aa27a237d1cc9d3d9f28c472f521f0163"><div class="ttname"><a href="classflow_1_1log_1_1Buffer__logger.html#aa27a237d1cc9d3d9f28c472f521f0163">flow::log::Buffer_logger::should_log</a></div><div class="ttdeci">bool should_log(Sev sev, const Component &amp;component) const override</div><div class="ttdoc">Implements interface method by returning true if the severity and component (which is allowed to be n...</div><div class="ttdef"><b>Definition:</b> <a href="buffer__logger_8cpp_source.html#l00034">buffer_logger.cpp:34</a></div></div>
<div class="ttc" id="aclassflow_1_1log_1_1Buffer__logger_html_ac5d382dae85e7c9f0f51e5e6eebd99a5"><div class="ttname"><a href="classflow_1_1log_1_1Buffer__logger.html#ac5d382dae85e7c9f0f51e5e6eebd99a5">flow::log::Buffer_logger::logs_asynchronously</a></div><div class="ttdeci">bool logs_asynchronously() const override</div><div class="ttdoc">Implements interface method by returning false, indicating that this Logger will not need the content...</div><div class="ttdef"><b>Definition:</b> <a href="buffer__logger_8cpp_source.html#l00039">buffer_logger.cpp:39</a></div></div>
<div class="ttc" id="aclassflow_1_1log_1_1Buffer__logger_html_af13a09b5360373f8aeb17f1e459fc677"><div class="ttname"><a href="classflow_1_1log_1_1Buffer__logger.html#af13a09b5360373f8aeb17f1e459fc677">flow::log::Buffer_logger::buffer_str_copy</a></div><div class="ttdeci">const std::string buffer_str_copy() const</div><div class="ttdoc">Returns a copy of buffer_str() in thread-safe fashion.</div><div class="ttdef"><b>Definition:</b> <a href="buffer__logger_8cpp_source.html#l00058">buffer_logger.cpp:58</a></div></div>
<div class="ttc" id="aclassflow_1_1log_1_1Component_html"><div class="ttname"><a href="classflow_1_1log_1_1Component.html">flow::log::Component</a></div><div class="ttdoc">A light-weight class, each object storing a component payload encoding an enum value from enum type o...</div><div class="ttdef"><b>Definition:</b> <a href="log_8hpp_source.html#l00839">log.hpp:840</a></div></div>
<div class="ttc" id="aclassflow_1_1log_1_1Config_html"><div class="ttname"><a href="classflow_1_1log_1_1Config.html">flow::log::Config</a></div><div class="ttdoc">Class used to configure the filtering and logging behavior of Loggers; its use in your custom Loggers...</div><div class="ttdef"><b>Definition:</b> <a href="config_8hpp_source.html#l00316">config.hpp:317</a></div></div>
<div class="ttc" id="aclassflow_1_1log_1_1Ostream__log__msg__writer_html_aba0a94e36e435aeb67bbc25fee8380f7"><div class="ttname"><a href="classflow_1_1log_1_1Ostream__log__msg__writer.html#aba0a94e36e435aeb67bbc25fee8380f7">flow::log::Ostream_log_msg_writer::log</a></div><div class="ttdeci">void log(const Msg_metadata &amp;metadata, util::String_view msg)</div><div class="ttdoc">Logs to the wrapped ostream the given message and associated metadata like severity and time stamp; p...</div><div class="ttdef"><b>Definition:</b> <a href="ostream__log__msg__writer_8cpp_source.html#l00074">ostream_log_msg_writer.cpp:74</a></div></div>
<div class="ttc" id="aclassflow_1_1util_1_1String__ostream_html_aa7682e71a5e96955a52643e63bf97ad0"><div class="ttname"><a href="classflow_1_1util_1_1String__ostream.html#aa7682e71a5e96955a52643e63bf97ad0">flow::util::String_ostream::str</a></div><div class="ttdeci">const std::string &amp; str() const</div><div class="ttdoc">Read-only access to the string being wrapped.</div><div class="ttdef"><b>Definition:</b> <a href="string__ostream_8cpp_source.html#l00043">string_ostream.cpp:43</a></div></div>
<div class="ttc" id="aconfig_8hpp_html"><div class="ttname"><a href="config_8hpp.html">config.hpp</a></div></div>
<div class="ttc" id="anamespaceflow_1_1log_html"><div class="ttname"><a href="namespaceflow_1_1log.html">flow::log</a></div><div class="ttdoc">Flow module providing logging functionality.</div><div class="ttdef"><b>Definition:</b> <a href="async__file__logger_8cpp_source.html#l00027">async_file_logger.cpp:28</a></div></div>
<div class="ttc" id="anamespaceflow_1_1log_html_a5c602384e6fe9d7642740ac2fae4ad04"><div class="ttname"><a href="namespaceflow_1_1log.html#a5c602384e6fe9d7642740ac2fae4ad04">flow::log::Sev</a></div><div class="ttdeci">Sev</div><div class="ttdoc">Enumeration containing one of several message severity levels, ordered from highest to lowest.</div><div class="ttdef"><b>Definition:</b> <a href="log__fwd_8hpp_source.html#l00223">log_fwd.hpp:224</a></div></div>
<div class="ttc" id="anamespaceflow_1_1util_html_a5d2247b715da63e4b960909561b90ae7"><div class="ttname"><a href="namespaceflow_1_1util.html#a5d2247b715da63e4b960909561b90ae7">flow::util::Lock_guard</a></div><div class="ttdeci">boost::unique_lock&lt; Mutex &gt; Lock_guard</div><div class="ttdoc">Short-hand for advanced-capability RAII lock guard for any mutex, ensuring exclusive ownership of tha...</div><div class="ttdef"><b>Definition:</b> <a href="util__fwd_8hpp_source.html#l00265">util_fwd.hpp:265</a></div></div>
<div class="ttc" id="anamespaceflow_1_1util_html_ae4dc52186797094b3040379ff19124c9"><div class="ttname"><a href="namespaceflow_1_1util.html#ae4dc52186797094b3040379ff19124c9">flow::util::String_view</a></div><div class="ttdeci">Basic_string_view&lt; char &gt; String_view</div><div class="ttdoc">Commonly used char-based Basic_string_view. See its doc header.</div><div class="ttdef"><b>Definition:</b> <a href="string__view_8hpp_source.html#l00191">string_view.hpp:191</a></div></div>
<div class="ttc" id="astructflow_1_1log_1_1Msg__metadata_html"><div class="ttname"><a href="structflow_1_1log_1_1Msg__metadata.html">flow::log::Msg_metadata</a></div><div class="ttdoc">Simple data store containing all of the information generated at every logging call site by flow::log...</div><div class="ttdef"><b>Definition:</b> <a href="log_8hpp_source.html#l01040">log.hpp:1041</a></div></div>
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